package models

import (
	"errors"
	"fmt"
	"math"
	"reflect"
	"strconv"
	"strings"

	"github.com/astaxie/beego/orm"
)

type Purchase struct {
	Id     int     `orm:"column(id);auto"`                       //
	Name   string  `orm:"column(name);size(255)"`                //采购主题
	Cid    int     `orm:"column(cid)"`                           //采购商ID
	Number string  `orm:"column(number);size(60)"`               //采购编号
	Uid    int     `orm:"column(uid)"`                           //采购者ID
	Cname  string  `orm:"column(cname);size(255)"`               //联系人
	Phone  string  `orm:"column(phone);size(60)"`                //联系方式
	Ctime  int     `orm:"column(ctime)"`                         //创建时间
	Zprice float64 `orm:"column(zprice);digits(10);decimals(2)"` //总价
	Ifpay  int     `orm:"column(ifpay)"`                         //0未付款 1已付款

	//记录商品数据
	Goods    []string `orm:"-"` //商品ID
	GoodsNum []string `orm:"-"` //数量
}

type Purchases struct {
	Id     int     `orm:"column(id);auto"`                       //
	Name   string  `orm:"column(name);size(255)"`                //采购主题
	Cnames string  `orm:"column(cnames);size(255)"`              //采购上
	Cid    int     `orm:"column(cid)"`                           //采购商ID
	Number string  `orm:"column(number);size(60)"`               //采购编号
	Uid    int     `orm:"column(uid)"`                           //采购者ID
	Cname  string  `orm:"column(cname);size(255)"`               //联系人
	Phone  string  `orm:"column(phone);size(60)"`                //联系方式
	Ctime  int     `orm:"column(ctime)"`                         //创建时间
	Zprice float64 `orm:"column(zprice);digits(10);decimals(2)"` //总价
	Ifpay  int     `orm:"column(ifpay)"`                         //0未付款 1已付款

	//记录商品数据
	Goods    []string `orm:"-"` //商品ID
	GoodsNum []string `orm:"-"` //数量
}

func (t *Purchase) TableName() string {
	return "my_purchase"
}

func init() {
	orm.RegisterModel(new(Purchase))
}

// AddPurchase insert a new Purchase into database and returns
// last inserted Id on success.
func AddPurchase(m *Purchase) (id int64, err error) {
	o := orm.NewOrm()
	id, err = o.Insert(m)

	for k, v := range m.Goods {
		var md PurchaseGoode
		md.Pid = int(id)
		i, _ := strconv.Atoi(v)
		md.Gid = i
		n, _ := strconv.Atoi(m.GoodsNum[k])
		md.Num = n
		md.Ctime = m.Ctime
		AddPurchaseGoode(&md)
	}

	return
}

func GetPurchaseList(page int64, page_size int64, where string) (count int64, l []Purchases) {
	o := orm.NewOrm()
	var err error
	qbs, _ := orm.NewQueryBuilder("mysql")
	qbs = qbs.Select("count(*) as count").From("my_purchase")
	if where != "" {
		qbs = qbs.Where(where)
	}
	sqls := qbs.String()
	err = o.Raw(sqls).QueryRow(&count)
	if err != nil {
		return
	}
	var offset int64
	if page <= 1 {
		offset = 0
	} else {
		offset = (page - 1) * page_size
	}
	if page*page_size > count {
		if page_size > count {
			offset = 0
		} else {
			s := math.Floor(float64(count)/float64(page_size)) * float64(page_size)
			offset = int64(s)
		}
	}

	qb, _ := orm.NewQueryBuilder("mysql")
	qb = qb.Select("my_purchase.*", "my_clients.name as cnames").From("my_purchase").
		LeftJoin("my_clients").On("my_purchase.cid=my_clients.id")
	if where != "" {
		qb = qb.Where(where)
	}
	qb = qb.Limit(int(page_size)).Offset(int(offset))
	sql := qb.String()
	_, err = o.Raw(sql).QueryRows(&l)
	fmt.Println(err)
	return
}

// GetPurchaseById retrieves Purchase by Id. Returns error if
// Id doesn't exist
func GetPurchaseById(id int) (v *Purchase, err error) {
	o := orm.NewOrm()
	v = &Purchase{Id: id}
	if err = o.Read(v); err == nil {
		return v, nil
	}
	return nil, err
}

// GetAllPurchase retrieves all Purchase matches certain condition. Returns empty list if
// no records exist
func GetAllPurchase(query map[string]string, fields []string, sortby []string, order []string,
	offset int64, limit int64) (ml []interface{}, err error) {
	o := orm.NewOrm()
	qs := o.QueryTable(new(Purchase))
	// query k=v
	for k, v := range query {
		// rewrite dot-notation to Object__Attribute
		k = strings.Replace(k, ".", "__", -1)
		if strings.Contains(k, "isnull") {
			qs = qs.Filter(k, (v == "true" || v == "1"))
		} else {
			qs = qs.Filter(k, v)
		}
	}
	// order by:
	var sortFields []string
	if len(sortby) != 0 {
		if len(sortby) == len(order) {
			// 1) for each sort field, there is an associated order
			for i, v := range sortby {
				orderby := ""
				if order[i] == "desc" {
					orderby = "-" + v
				} else if order[i] == "asc" {
					orderby = v
				} else {
					return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
				}
				sortFields = append(sortFields, orderby)
			}
			qs = qs.OrderBy(sortFields...)
		} else if len(sortby) != len(order) && len(order) == 1 {
			// 2) there is exactly one order, all the sorted fields will be sorted by this order
			for _, v := range sortby {
				orderby := ""
				if order[0] == "desc" {
					orderby = "-" + v
				} else if order[0] == "asc" {
					orderby = v
				} else {
					return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
				}
				sortFields = append(sortFields, orderby)
			}
		} else if len(sortby) != len(order) && len(order) != 1 {
			return nil, errors.New("Error: 'sortby', 'order' sizes mismatch or 'order' size is not 1")
		}
	} else {
		if len(order) != 0 {
			return nil, errors.New("Error: unused 'order' fields")
		}
	}

	var l []Purchase
	qs = qs.OrderBy(sortFields...)
	if _, err = qs.Limit(limit, offset).All(&l, fields...); err == nil {
		if len(fields) == 0 {
			for _, v := range l {
				ml = append(ml, v)
			}
		} else {
			// trim unused fields
			for _, v := range l {
				m := make(map[string]interface{})
				val := reflect.ValueOf(v)
				for _, fname := range fields {
					m[fname] = val.FieldByName(fname).Interface()
				}
				ml = append(ml, m)
			}
		}
		return ml, nil
	}
	return nil, err
}

// UpdatePurchase updates Purchase by Id and returns error if
// the record to be updated doesn't exist
func UpdatePurchaseById(m *Purchase) (err error) {
	o := orm.NewOrm()
	_, err = o.QueryTable(new(Purchase)).Filter("Id", m.Id).Update(orm.Params{
		"Cname": m.Cname,
		"Phone": m.Phone,
		"Ifpay": m.Ifpay,
	})
	return
}

func UpdatePurchaseIfpayById(id int) (err error) {
	o := orm.NewOrm()
	_, err = o.QueryTable(new(Purchase)).Filter("Id", id).Update(orm.Params{
		"Ifpay": 1,
	})
	return
}

// DeletePurchase deletes Purchase by Id and returns error if
// the record to be deleted doesn't exist
func DeletePurchase(id int) (err error) {
	o := orm.NewOrm()
	v := Purchase{Id: id}
	// ascertain id exists in the database
	if err = o.Read(&v); err == nil {
		var num int64
		if num, err = o.Delete(&Purchase{Id: id}); err == nil {
			fmt.Println("Number of records deleted in database:", num)
		}
	}
	return
}
